I visit HN every so often but never felt the need to comment, until just a few minutes ago.

Yes, what you've described, I also went through something similar.

I've been programming little over two decades now. Been an autocomplete (ctags, intellisense, lsp) user throughout my career. Never had any real problems with them; they were convenient tools, nothing that different from someone using grep/fd etc.

The codebase I (used to) work on is a 30m+ line behemoth, and API frequently changes underneath me; an LSP is crucial to get the work done. How could anybody keep two dozen+ minor-naming and subtle-semantic variations of the same method in their head? I'll say yes to auto-complete any day of the week, I thought.

About two years ago, I've noticed some worrying cognitive signs. Out of the blue I realized I could not remember the name of methods, classes, interfaces, even the ones that I use daily. I could code, there wasn't any problem with that. But I could not write anything down without auto-complete. I couldn't even fill the arguments of a function without the LSP holding my hand throughout the ordeal.

With the realization that both my grandmothers went through dementia/alzheimer's, I truly felt like walls were closing in on me, in real time. Of course, I went for a check up, which came out clean, but I could not shake that feeling of impending doom.

By luck ---and some hefty dose of depression due to unrelated personal reasons--- I started writing a toy compiler in C, something that I had no experience with whatsoever. With just a text editor, because I dreaded having to install visual studio on a two decade old computer (which was the best I had under the circumstances). Despite forcing myself to fumble through, a few days later I noticed that the entire code base was in my head. I knew precisely what I wrote, how I wrote it.

Life went on and I went back to work. And only then I noticed. I was waiting for the LSP to catch up and fill the correct type, my mind went back to my crappy lexer. Programmer? No, I felt like a factory worker on an assembly line.

A month after that I finally gave my resignation, then started a new (self-employed) programming job. For the past year I've been working on a game + an engine, without intellisense or LSP. In fact, I even disabled syntax highlighting a few weeks in, and never turned it back on. I've ditched quite a few of my regular tools, opting for simpler (often homemade) alternatives; simple bash script instead of cmake for example.

Suffice it to say, I've come to some personal conclusions. These conclusions stem from my personal bias, true, but I do feel strongly, that they apply widely to the field as a whole.

In short:

1) LSP, intellisense, code completion, are overall harmful.

2) Syntax highlighting does not work (most of the time), it just satisfies the part of our brains that like to recognize patterns.

3) Complex and highly integrated tools are a net negative unless they are purpose built.

Most people will vehemently disagree with all of the above. That is fine; I'm not on a crusade against the machine, so to speak. I just wanted to share my view since I resonated with the post I'm responding to. But I will still briefly explain what I mean, in case if anyone's curious. (In part 2, because comment was too long)